Friday, 31 October 2008

Thank you to all that participated in last night's Webinar with a live ... Though we ran out of time before it was done ... SBS 2008 install!

We were fortunate that we had a backup Hyper-V box on stand-by as the one we were going to use choked when starting the SBS VM!

I had test started it prior to the Webinar and it worked! But I made the mistake of importing an ISA VM onto that Hyper-V box to provide an Internet gateway. So, something happened either during or after the import that caused the existing SBS VM to choke.

Chi, you are right and I stand corrected on there being a difference between RAID 0+1 and RAID 1+0. After seeing your comment, I delved into an online search for clarification. The sites I came up with were not absolutely clear on the distinction or even contradicted each other!

So, if anyone has a good link with good animated diagrams explaining the difference betwwen the two, please post them in the comments.

Thanks for catching me on that one Chi! :)

Thanks also to everyone that took the time to e-mail myself or Harry with affirmations! Being new to the Webinar scene and LiveMeeting can be pretty intimidating!

2 comments:

I don't have a handy reference, but 1+0 is a stripe of two mirror sets (mirror, then add stripe is how I remember it) and is most commonly known as RAID-10.

0+1 is a mirror of two stripe sets (stripe, then add mirror) and is less commonly used than 1+0. 0+1 is more common when the controller supports duplexing, whereby you can mirror the stripe sets across controllers. 5+1 (RAID-51) is also a popular choice for duplexing.

The degradation and subsequent rebuild of 1+0 and 0+1 is also quite different. A single drive failure of 1+0 means that only two drives are involved in a rebuild (the failed drive and its mirrored partner), where a single drive failure in 0+1 means that the stripe set is taken offline, leaving a single stripe set for operation and rebuild. That is, all four drives are used in a rebuild.

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Our primary IT vertical is accounting firms since 1998. From accounting app support through to highly available solutions for accounting firms we've got it covered. I'm a Microsoft MVP since 2009. First on SBS and then starting in 2014 on Cluster.